JPH0719285A - Clutch disc for vehicle - Google Patents

Abstract

PURPOSE:To provide a clutch disc for a vehicle having a vibration damping means which is constituted to change a damping force of relative rotation vibration, generated between the insertion boss; of a clutch disc and a lining support plate according to the magnitude of a load exerted on the clutch disc. CONSTITUTION:The operation chamber of a viscous coupling 20 capable of damping vibration of a coil spring 18 located between a housing 12 and a lining support plate 14 is formed between an internal coupling member 22 rotated integrally with an insertion boss 11 and an external coupling member 23 rotated integrally with the lining support plate 14. Further, inner and outer plates 24 and 25 alternately arranged in the operating chamber in a state to be spline- fitted in the internal and external coupling members 22 and 23 have respective openings and are disposed such that an area of a lap between the adjoining plates efecting relative movement is increased according to a relative rotation angle between the plates effecting relative movement along with the increase of a load exerted on the coil spring 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular clutch disc, and more particularly, to a vibration of a torsion spring interposed between a housing that rotates integrally with an insertion boss and a lining support plate that supports the clutch lining. The present invention relates to a vehicle clutch disc equipped with a vibration damping means capable of damping.

[0002]

2. Description of the Related Art Conventionally, a friction clutch is generally provided between an engine of an automobile and a manual transmission, and the driving force of the engine is transmitted to or cut off from the transmission in response to a driver's clutch pedal operation. You can The vehicle clutch disc in this type of friction clutch is
Generally, a bayonet boss engaged with the input shaft of the transmission,
A lining support plate that supports a clutch lining that is pressed against the flywheel of the engine, and the lining support plate is rotatable relative to the insertion boss in forward and reverse directions within a predetermined relative angular range around the axis. is there. or,
A torsion spring such as a coil spring is interposed between the two to absorb the impact in the rotational direction when the clutch lining comes into contact with the flywheel of the engine and also to the clutch lining via this torsion spring. The transmitted driving force of the engine is transmitted to the input shaft of the transmission. Therefore, since the torsion spring repeatedly expands and contracts according to the magnitude of the driving force transmitted between the insertion boss and the lining support plate, when torsional vibration occurs due to torque fluctuation of the engine, the insertion boss and the lining. Relative rotational vibration occurs between the support plate and the support plate.

Therefore, in order to damp such relative rotational vibration, various vehicle clutch discs have been proposed in which various forms of vibration damping means are interposed between the insertion boss and the lining support plate. For example, JP-A-63-115
Like the clutch disc disclosed in Japanese Patent No. 915, a torsion spring is provided between the housing and the lining support plate that rotate integrally with the insertion boss, and a viscous fluid is provided between the insertion boss and the lining support plate. There is a vibration damping means provided with a joint (a viscous coupling) so that a damping force proportional to the relative angular velocity between the insertion boss and the lining support plate can be obtained. The vibration damping means provided with such a viscous coupling produces a damping action even when a vibration system moment appears when there is no load, and the vibration damping degree is proportional to the relative angular velocity between the insertion boss and the lining support plate. Can be large. Further, the vibration damping means operates without wear, and is not affected by fluctuations in the friction coefficient of the clutch lining.

[0004]

By the way, the vehicle clutch disc is subjected to a large driving force generated by the engine, such as when the vehicle starts or when the vehicle is traveling at high speed, or when the vehicle is idling or at a constant speed. A small engine load may act like when driving at low speed. Therefore,
The viscous coupling as a vibration damping means,
The vibration damping characteristics that can absorb the vibration by applying the optimum damping force even when the relative rotational vibration occurs when the engine load is large and when the relative rotational vibration occurs when the engine load is small Desired.

However, the viscous coupling as described above merely generates a damping force due to the shear resistance of the viscous fluid proportional to the relative angular velocity between the insertion boss and the lining support plate, and responds to changes in engine load. Damping force cannot be generated. Therefore, when the viscous coupling is set so that a large damping force can be obtained when the engine load is large, the damping force is too large and the vibration is transmitted when the engine load is small. When the viscous coupling is set so that a sufficient damping force can be obtained under a small load, the damping force is small under a large engine load and the vibration cannot be sufficiently damped. Good vibration damping cannot be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems, and to reduce the relative rotational vibration damping force generated between the insert boss of the clutch disc and the lining support plate to the magnitude of the load acting on the clutch disc. (EN) Provided is a vehicular clutch disc provided with a good vibration damping means that can be changed according to the situation.

[0007]

The above object of the present invention is to provide a housing that rotates integrally with the insertion boss, a lining support plate that supports the clutch lining, and an interposition between the housing and the lining support plate. In a vehicle clutch disk comprising a torsion spring capable of transmitting torque and a vibration damping means capable of damping the vibration of the torsion spring, the vibration damping means is formed between the insertion boss and the lining support plate and is a viscous fluid. And a pair of plate sets alternately arranged in the working chamber and engaged with the insertion boss and the lining support plate in the rotational direction, respectively, and the pair of plate sets are respectively Has an opening and moves relative to it as the load applied to the torsion spring increases. It is achieved by a vehicle clutch discs, characterized in that is configured to wrap area between the plates adjacent to increase in accordance with the relative rotation angle of the stomach.

The openings formed in the plates are made asymmetric with respect to the plate center line, so that the lap area between the adjacent plates can be adjusted according to the relative rotation angles of the relative movements. It can be changed continuously. An elastic member such as a coil spring or rubber is used as the torsion spring.

[0009]

As the driving force input to the clutch disc increases / decreases, the bending amount of the torsion spring changes, and the relative rotation angle of each plate set increases / decreases. Therefore, when the deflection amount of the torsion spring is small and the relative rotation angle of each plate group is small, arrange each plate group so that the openings of adjacent plates do not overlap each other greatly, and increase the viscous resistance between the adjacent plates. By reducing the lap area between each plate generated,
Reduce the resulting damping force.

On the contrary, when the deflection amount of the torsion spring is large and the relative rotation angle of each plate group is large, the openings of adjacent plates largely overlap with each other to increase the lap area between the plates which generate viscous resistance. Therefore, a larger damping force can be obtained as compared with the case where the openings do not largely overlap each other.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle clutch disk according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, the structure of the vehicle clutch disc 10 according to the present embodiment will be described with reference to FIG.

The vehicle clutch disc 10 includes a housing 12 that rotates integrally with the insertion boss 11, a lining support plate 14 that supports the clutch lining 15, and a housing 12 and the lining support plate 14. Torsion spring 18 that can transmit torque
And a viscous coupling 20 which is a vibration damping means capable of damping the vibration of the torsion spring 18.

A spline 11a provided on the inner peripheral surface of the insertion boss 11 is engaged with the input shaft of a transmission (not shown) in the rotational direction, and a spline 11b provided on the outer peripheral surface thereof will be described later. The housing 12 and the inner plate 24 of the viscous coupling 20 are rotationally engaged with each other. The inner plate 24 in this embodiment is spline-fitted to the spline 11b via an inner joint member 22 fitted externally to the spline 11b.

The housing 12 is formed by stacking a pair of annular plate members so as to be coaxial with each other, and the radially inner peripheral portion thereof is expanded in the axial direction to accommodate the viscous coupling 20, and the outer peripheral portion thereof. Are superposed so as to movably sandwich a lining support plate 14 described later. The radially inner peripheral end portion is spline-fitted near both ends of the spline 11b outside the insertion boss 11 and is prevented from coming off by the snap ring 13.

The lining support plate 14 is a substantially annular plate member, and a clutch lining 15 which is pressed by a flywheel of an engine (not shown) is fixed to the outer peripheral side portion by rivets 16. Further, an inner peripheral side portion thereof constitutes a part of an outer joint member 23 which is fitted to the inner joint member 22 so as to be rotatable relative to the inner joint member 22 to define the working chamber 21, and a spline is formed on the inner peripheral surface thereof. Has been formed.

Further, the lining support plate 14 is sandwiched so as to be rotatable relative to the housing 12, and the sleeve is provided in the elongated hole 19 provided so as to extend in the circumferential direction of the lining support plate 14. A rivet 28 crimped to the housing 12 is inserted so as not to press the lining support plate 14 by 17, and a relative rotation angle of the lining support plate 14 with respect to the housing 12 is within a range defined in forward and reverse rotation directions. Limited to within.

Further, in order to transmit the driving force between the housing 12 and the lining support plate 14, the clutch lining 15 absorbs the impact in the rotational direction when the clutch lining 15 is brought into contact with the flywheel of the engine. A coil spring 18, which is a torsion spring, is interposed. The coil springs 18 correspond to each other and the housing 1
2 and the lining support plate 14 are received in windows 29 provided at equal intervals in the circumferential direction.

Next, the viscous coupling 20 which is the vibration damping means in the vehicle clutch disc 10 of this embodiment will be described. The viscous coupling 20
Is a plurality of inner plates 24 and outer plates 25 formed by punching a thin plate into an annular shape in the working chamber 21 defined by the inner joint member 22 and the outer joint member 23 and sealed by the rolling packing 27. Are alternately arranged and a viscous fluid such as silicone oil is enclosed.

An inner peripheral portion of the inner plate 24 is rotationally engaged with the inner joint member 22 via a spline so as to rotate integrally with the housing 12. An outer peripheral portion of the outer plate 25 is rotationally engaged with the outer joint member 23 via a spline, so that the lining support plate 14
Rotates integrally with. Also, these inner plates 24
In the outer plate 25, as shown in FIG. 2, substantially rectangular openings 31a and openings 3 extending in the radial direction, respectively.
A plurality of 2a are formed with a predetermined circumferential interval. The openings 31a and 32a of the inner plate 24 and the outer plate 25 adjacent to each other do not overlap each other when the relative rotation position of the lining support plate 14 with respect to the housing 12 is the initial position.
When the lining support plate 14 rotates relative to the housing 12 in the forward and reverse rotation directions, at least some of the openings 31a and the openings 32a adjacent to each other are arranged to gradually overlap with each other.

Next, the operation of the viscous coupling 20 will be described. First, the vehicle clutch disc 1
When the driving force input to 0 is small, the elastic biasing force of the coil spring 18 interposed between the clutch housing 12 and the lining support plate 14 causes the clutch housing 12 and the lining support plate 14 to move relative to each other. The rotation position is almost the initial position, and the relative rotation angle is small.
Therefore, the openings 31a and 32a provided in the inner plate 24 and the outer plate 25 do not overlap with each other as shown in FIG.

On the other hand, the vehicle clutch disc 1
When a large driving force is input to 0, the clutch housing 12 and the lining support plate 14 compress the coil spring 18 interposed therebetween and relatively rotate, and the relative rotation of both The angle becomes the maximum value θ. Accordingly, as shown in FIG. 3, the relative rotation angle of the inner plate 24 and the outer plate 25 also becomes θ, so that the openings 31a and 32a provided in the inner plate 24 and the outer plate 25 are partially As shown in FIG. 3, they overlap each other.

As a result, when the openings 31a and 32a overlap each other, the lap area between the plates that generate viscous resistance between adjacent plates becomes larger than that when the openings 31a and 32a do not overlap, and the obtained damping force is large. Becomes Therefore, the viscous coupling 20 is
When the driving force input to the vehicle clutch disc 10 increases, the lap area between the inner plate 24 and the outer plate 25 adjacent to each other increases, the viscous resistance increases, and the damping force increases. On the contrary, when the driving force input to the vehicle clutch disc 10 is small, the lap area of the inner plate 24 and the outer plate 25 decreases, the viscous resistance decreases, and the damping force decreases.

That is, in the vehicle clutch disc 10 of this embodiment, the damping force of the viscous coupling 20 changes according to the input load, so that the relative rotation generated between the insertion boss 11 and the lining support plate 14. The vibration damping force can always be optimized according to the running conditions of the vehicle. For example, when a large driving force is input to the vehicle clutch disc 10 and clutch vibration starts, such as when the vehicle starts or runs at high speed, the viscous coupling 20 generates a large damping force and starts. It is possible to quickly damp the vibration associated with. Even when the driving force is not large like when driving at a constant low speed, the clutch vibration is absorbed by the optimum damping force even when the transmission resonates due to engine torque fluctuations and a muffled noise is generated in the vehicle. Then, the unpleasant muffled sound can be reduced.

The opening formed in each plate is
It goes without saying that various shapes can be adopted without being limited to the shape of the above embodiment. A viscous coupling 40, which is a vibration damping means for a vehicle clutch disc according to another embodiment shown in FIGS. 4 and 5, is an inner plate 24 instead of the inner plate 24 and the outer plate 25 in the viscous coupling 20 of the above embodiment. All are the same except that the plate 41 and the outer plate 42 are used.

That is, as shown in FIG. 4, the inner plate 4 in the viscous coupling 40 of the present embodiment.
1, a wide slit-shaped opening 41a extending in the radial direction is formed on the outer peripheral end side of the outer plate 42 and on the inner peripheral end side of the outer plate 42.
42a are formed at equal intervals in the circumferential direction. The total area of the openings 41a and 42a is about half of the total area of the inner plate 41 and the outer plate 42, respectively. Further, as shown in FIG. 5, when the relative rotation angle of the outer plate 42 with respect to the inner plate 41 in the forward and reverse rotation directions is the maximum value θ, the openings 41a and 42a are configured to overlap each other.

Therefore, when the relative rotation angle of the outer plate 42 with respect to the inner plate 41 in the normal and reverse rotation directions is substantially zero, the openings 41a, 42a provided in the adjacent plates do not overlap each other, and the adjacent plates are not overlapped. The lap area between each plate that generates viscous resistance between the two is extremely small. On the other hand, when the swing angle of the outer plate 42 with respect to the inner plate 41 in the forward and reverse rotation directions is the maximum value θ, the openings 41a,
Since 42a overlaps each other, the lap area between the plates that generate viscous drag between adjacent plates increases to about half of the total area of each plate.

That is, in the viscous coupling 40 of this embodiment, the viscous resistance rapidly increases as the relative rotation angle of the outer plate 42 with respect to the inner plate 41 in the normal and reverse rotation directions increases, and the insertion boss 11 and the lining support plate 14 are increased. It is a characteristic that the damping force generated between and increases rapidly. A viscous coupling 50, which is a vibration damping means for a vehicle clutch disc according to another embodiment shown in FIGS. 6 and 7, is an inner plate 24 and an outer plate 25 instead of the inner plate 24 and the outer plate 25 in the viscous coupling 20 of the above embodiment. All are the same except that the plate 51 and the outer plate 52 are used.

That is, as shown in FIG. 6, the inner plate 51 and the outer plate 52 of the viscous coupling 50 of this embodiment have substantially trapezoidal openings 51a which are asymmetrical with respect to the plate center line. A plurality of 52a are formed with a predetermined circumferential interval. Further, the inner plate 51 and the outer plate 52 are
The corresponding substantially trapezoidal openings 51a and 52a are alternately arranged in the working chamber 21 so as to be inclined to the opposite sides with respect to the plate center line. The openings 51a and 52a of the inner plate 51 and the outer plate 52 which are adjacent to each other do not substantially overlap each other when the relative rotation position of the lining support plate 14 with respect to the housing 12 is the initial position, and the openings 12a and 52a with respect to the housing 12. When the lining support plate 14 relatively rotates in the forward and reverse rotation directions, at least some of the openings 51a and the openings 52a adjacent to each other are arranged to gradually overlap with each other.

As a result, as the relative rotation angle of the outer plate 52 with respect to the inner plate 51 in the forward and reverse rotation directions increases, the substantially trapezoidal openings 51a and 52a gradually overlap with each other from the corners, so that between adjacent plates. The lap area between each plate that produces viscous drag increases continuously and slowly. Therefore, the viscous coupling 50 is set to have a characteristic that the damping force generated between the insertion boss 11 and the lining support plate 14 continuously and slowly increases.

The vehicle clutch disc of the present invention is
The configuration and the shape of each component in the above embodiment are not limited, and, for example, the housing, the lining support plate, the torsion spring, each plate set, and the like can take various forms based on the gist of the present invention. Further, the engaging means for engaging the respective plate sets with the insertion boss and the lining support plate in the rotational direction is not limited to the spline connection as in the above embodiment, and each plate set is integrated with the insertion boss and the lining support plate, respectively. Direct rotation or indirect engagement may be used as long as the rotation is possible.

[0031]

According to the vehicular clutch disc of the present invention, when the driving force input to the clutch disc is small and the deflection amount of the torsion spring is small, it is arranged between the insertion boss and the lining support plate. The lap area between adjacent plates in each plate set of the viscous coupling is small, and the damping force of the viscous coupling is small. Further, when the driving force input to the clutch disc is large and the bending amount of the torsion spring is large, the lap area between adjacent plates of each plate set becomes large, and the damping force of the viscous coupling becomes large. .

Therefore, the damping force of the viscous coupling changes according to the load input to the clutch disc, and the damping force of the relative rotational vibration generated between the insertion boss and the lining support plate changes according to the running conditions of the vehicle. Can always be optimal. Therefore, for a vehicle provided with a good vibration damping means that can change the damping force of the relative rotational vibration generated between the insertion boss of the clutch disc and the lining support plate according to the magnitude of the load acting on the clutch disc. A clutch disc can be provided.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a vehicle clutch disc according to an embodiment of the present invention.

FIG. 2 is a front sectional view of relevant parts for explaining a viscous coupling operating state of the vehicle clutch disc shown in FIG.

FIG. 3 is a front sectional view of a main part for explaining a viscous coupling operating state of the vehicle clutch disc shown in FIG. 1.

FIG. 4 is a front sectional view of relevant parts for explaining a viscous coupling operation state of a vehicle clutch disc according to another embodiment of the present invention.

FIG. 5 is a front sectional view of an essential part for explaining a viscous coupling operation state of a vehicle clutch disc according to another embodiment of the present invention.

FIG. 6 is a front sectional view of an essential part for explaining a viscous coupling operation state of a vehicle clutch disc according to another embodiment of the present invention.

FIG. 7 is a front sectional view of relevant parts for explaining a viscous coupling operation state of a vehicle clutch disc according to another embodiment of the present invention.

[Explanation of symbols]

 10 Vehicle Clutch Disc 11 Inserting Boss 11a Spline 11b Spline 12 Housing 13 Snap Ring 14 Lining Support Plate 15 Clutch Lining 16 Rivet 17 Sleeve 18 Coil Spring 20 Viscous Coupling 21 Working Chamber 22 Inner Joint Member 23 Outer Joint Member 24 Inner Plate 24a Inner plate opening 25 Outer plate 25a Outer plate opening 26 Snap ring 27 Rolling packing 28 Rivet 29 Window

Claims (1)

[Claims] 1. A housing that rotates integrally with an insertion boss, a lining support plate that supports a clutch lining, a torsion spring that is interposed between the housing and the lining support plate, and is capable of transmitting torque, and the torsion spring. A vehicle-use clutch disc comprising: a vibration damping means capable of damping the vibration of the above; and a vibration damping means, wherein the vibration damping means is formed between the insertion boss and the lining support plate and filled with a viscous fluid, and the working chamber. And a pair of plate groups that are alternately arranged and engaged with the insertion boss and the lining support plate in the rotational direction, respectively, and each of the pair of plate groups has an opening, and a load applied to the torsion spring. Adjacent to each other according to their relative rotation angles that move relative to each other The vehicle clutch disc, wherein the wrap area between the plates is configured to increase.